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package testing
import (
"bytes"
"encoding/hex"
"fmt"
"github.com/aws/smithy-go/document"
"io"
"io/ioutil"
"net/http"
"github.com/google/go-cmp/cmp"
)
// CompareValues compares two values to determine if they are equal.
func CompareValues(expect, actual interface{}, opts ...cmp.Option) error {
opts = append(make([]cmp.Option, 0, len(opts)+1), opts...)
var skippedReaders filterSkipDifferentIoReader
opts = append(opts,
cmp.Transformer("http.NoBody", transformHTTPNoBodyToNil),
cmp.FilterValues(skippedReaders.filter, cmp.Ignore()),
cmp.Comparer(compareDocumentTypes),
)
if diff := cmp.Diff(expect, actual, opts...); len(diff) != 0 {
return fmt.Errorf("values do not match\n%s", diff)
}
var errs []error
for _, s := range skippedReaders {
if err := CompareReaders(s.A, s.B); err != nil {
errs = append(errs, err)
}
}
if len(errs) != 0 {
return fmt.Errorf("io.Readers have different values\n%v", errs)
}
return nil
}
type documentInterface interface {
document.Marshaler
document.Unmarshaler
}
func compareDocumentTypes(x documentInterface, y documentInterface) bool {
xBytes, err := x.MarshalSmithyDocument()
if err != nil {
panic(fmt.Sprintf("MarshalSmithyDocument error: %v", err))
}
yBytes, err := y.MarshalSmithyDocument()
if err != nil {
panic(fmt.Sprintf("MarshalSmithyDocument error: %v", err))
}
return JSONEqual(xBytes, yBytes) == nil
}
func transformHTTPNoBodyToNil(v io.Reader) io.Reader {
if v == http.NoBody {
return nil
}
return v
}
type filterSkipDifferentIoReader []skippedReaders
func (f *filterSkipDifferentIoReader) filter(a, b io.Reader) bool {
if a == nil || b == nil {
return false
}
//at, bt := reflect.TypeOf(a), reflect.TypeOf(b)
//for at.Kind() == reflect.Ptr {
// at = at.Elem()
//}
//for bt.Kind() == reflect.Ptr {
// bt = bt.Elem()
//}
//// The underlying reader types are the same they can be compared directly.
//if at == bt {
// return false
//}
*f = append(*f, skippedReaders{A: a, B: b})
return true
}
type skippedReaders struct {
A, B io.Reader
}
// CompareReaders two io.Reader values together to determine if they are equal.
// Will read the contents of the readers until they are empty.
func CompareReaders(expect, actual io.Reader) error {
e, err := ioutil.ReadAll(expect)
if err != nil {
return fmt.Errorf("failed to read expect body, %w", err)
}
a, err := ioutil.ReadAll(actual)
if err != nil {
return fmt.Errorf("failed to read actual body, %w", err)
}
if !bytes.Equal(e, a) {
return fmt.Errorf("bytes do not match\nexpect:\n%s\nactual:\n%s",
hex.Dump(e), hex.Dump(a))
}
return nil
}
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